Questions tagged [odds-ratio]

A measure of association between two binary variables equal to the odds of a 'positive' outcome in 1 variable divided by the odds in the other. The OR ranges (0, infinity). It has a strong connection to logistic regression.

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Calculating ORs for an interaction term

Do you know the answer to this question? Ratgrp stands for lung function (FEV1/FVC)*100 and it has two categories: 1: Lung function less than 70 2: Lung function ...
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Odds ratio direction changes in multinomial logistic regression

I am doing a multinomial logistic regression in R for an outcome variable with four categories, and 9 categorical independent variables. My dataset contains 1408 observations. When I run the model ...
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Crude multivariate binomial regression OR vs univariate binomial regression OR?

I've performed an univariate binomial regression with OR (95% CI) and I obtain this result: ...
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Is it possible to give a single Odds Ratio for two independent variables?

I have been asked by co-authors on a paper to fill in the Odds Ratios marked as (?) in a table like the one below. Country of origin Land A (Odds Ratio) Land B (Odds Ratio) Number of people who meet ...
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Logistic regression: restrict the prediction range [duplicate]

I am running a basic logistic regression with a single independent variable (X) and one dependent variable (y). In the accompanying figure, the logistic regression predicts values that tend to 0 and 1 ...
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Interpreting Fisher's exact test OR, CI and p-values

In the context of Fisher's exact test results, it seems that a bunch of online tutorials mainly focus on interpreting the p-value exclusively, without considering the confidence intervals or the odds ...
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Ordinal Logistic Regression SPSS Interpretation

I have data from a questionnaire study structured like so: Age - Ordinal (18-24, 25-34, 35-44, 45-54, 55+) Gender - Nominal (Male, Female) AnxietyType - Nominal (Self-diagnosed, Professionally ...
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Find the impacts of alleles on the intensity of a disease

I have a dataset, I attach a sample of my data and the code. I have one column which shows the intensity value of a disease, one column which shows that its weak of moderate and the other columns are ...
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Modelling of odds ratio with continuous & categorical covariates

We've completed a systematic review of % diagnosed among female sex workers (FSW) living with HIV across Sub-Saharan Africa (SSA). In our Objective 1, we model this proportion $p_s$ as: \begin{aligned}...
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Comparing significance of categorical levels in logistic regression

I'm running a logistic regression on some data that has a binary outcome and several input variables, one of which is categorical with 5 levels. I'm using one of these levels as the reference, and so ...
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Regression analysis with single outcome variable and binary independent variables

This is a meta-analysis. I'm looking at factors associated with vaccine acceptance in many countries. Looking at previous studies in different countries, I recorded factors that are associated with ...
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What references discuss the problems with phi as an association measure?

(Olivier (2013) states that many have pointed out problems with $\phi$ as an association measure and advocate the use of odds ratios as an alternative Unfortunately, it does not give citations for ...
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Psuedo-"Odds ratio" for multiple columns

I have a dataset with a categorical target ($y$) and multiple categorical features ($x_1$, $x_2$, ..., $x_i$). I have been able to successfully use a logistic regression model to calculate an odds ...
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Interpretation of an interaction effect (ratio of odds ratios) when using effect coding

I ran a multilevel logistic regression model using function glmer from R package lme4. All of my predictors are binary and I have used effect coding, i.e., coding -...
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Why are my odds ratio confidence intervals so wide?

I'm pretty new to categorical data analysis. I'm trying to understand why my confidence intervals are so wide, I've never seen CI's this wide. From what I'm reading online this is mostly related to ...
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How to interpret odds ratios by emmeans for glmmTMB-beta

I fit this mixed model with beta for the response variable: photochemical efficiency or Fv/Fm and the predictor variables are categorical: ...
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Logistic regression odds vs Survival analysis odds

Why do I get significantly different answers from the logistic regression and survival analyses? How can I fix this code? Logistic regression: ...
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How to convert Standarized Mean Difference to OR in skewed data?

There are many methods to convert Standarized Mean Differences to Odds Ratios for meta-analysis (ln(OR) = -1.8 SMD), but none that i have found really deals with skewed summary data. Do you think i ...
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Is it appropriate to present predicted probabilities from emmeans for a mixed-effects binomial logistic regression?

I am trying to understand how to analyze data for a generalized mixed model (GLMM) with a binary response. I am interested in visualizing the predicted probabilities, as well as a measure of effect ...
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Interpreting normalized value in logistic regression

I'm trying to interpret results from my logistic regression. I normalized the values between 0 and 100 because I had many variables with different units. My intercept is -0.741 and I'm using that to ...
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Mixed beta regression interpretation with categorical predictor

I have run mixed beta regressions on proportional data but I am struggling in my interpretation of the results. I understand this has been asked before but I have a categorical predictor with four ...
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English meaning of risk vs odds? [duplicate]

I am trying to learn more about the difference between risk vs odds (e.g. relative risk, odds ratio). Since English is not my first language, these words have identical meanings to me: Smokers have ...
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Is it possible to perform a meta-analysis of multiple outcomes and multiple predictors?

I have a pool of 20-ish quantitative studies that report odds ratios for a particular outcome (e.g. homelessness) but most studies will also report a few more outcomes. All of these studies report the ...
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Can I do a Meta-Analysis for Odds Ratio's for continuous predictor (age) with Binary outcome (Affliction, yes or no) in R?

I'm looking for a way to conduct a Meta-analysis on Odds Ratio's from several studies/article's. The thing is that my OR's are based on logistic regression's with continuous predictors (outcome is ...
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Why marginal odds in frequency matched case-control?

Let $D$ denote sampling with $D=1$ indicating subject being sampled and $D=0$ otherwise. $W$ denotes intrinsic variable of subjects, $X$ denotes exposure of interest and $Y$ denotes the binary outcome....
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Correct interpretation of a logistic regression coefficient

I have a simple confusion regarding the interpretation of logistic regression. Suppose married people are more likely to be employed compared to single people. In here, unemployment = 0, employment = ...
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Odds and expected value in betting

I'm reading an article about expected value in betting, I got stuck at the very beginning: Let’s use a coin toss as an example of calculating expected value. Assuming the coin and the toss are fair, ...
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Risk ratio or odds ratio?

I have a question which may seem stupid. This is for a retrospective cohort study. I have a table like this for my outcome: Among the 20,000 patients in group A, 4671 are dead (23.55%). Among 50,000 ...
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Calculating Odds ratio with exclusion criteria

I had a question about how to perform an odds ratio when the group has an exclusion criterion. Let's say I am trying to find the association between surgery and suicide. I wanted to control for people ...
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Odds Ratio or 2 Prop Z Test

We would like to conduct an AB Test between 2 groups of people and the apps that people have to see which ones over or underindex. Which is more appropriate odds ratio or 2 proportional z test and why?...
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Computing odds ratios for multiple dichotomous DVs in a within-person, mixed-effects design?

I have an experiment where people participate in a series of tasks (say 4) and then are scored based on their performance (pass/fail). The order of the tasks is randomized. I want to predict ...
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Univariate odds ratio calculation - by hand versus log regression

If I have only one binary predictor variable for a binary outcome, is there any meaningful difference between doing hand calculation of odds ratio (OR = ad/bc), versus doing a univariate logistic ...
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What are the comparative advantages and disadvantages of interpreting regression output using marginal effects vs. ratios?

In models with a discrete dependent variable and/or linear models with non-linear right-hand specifications (interactions, polynomials, etc.), interpreting the association between Y and BX becomes ...
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Estimates of Cox Proportional Hazards Model

Why do some studies that utilize the Cox Proportional Hazards Model analysis use relative risks, others used odds ratios, and others used hazard ratios?
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Combining RR/OR

I am doing meta analysis for my thesis and I have a problem with my data. I want to investigate whether psychiatric comorbidity have effect on increasing risk to my outcome. I got 3 studies that ...
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My odds ratio and CI’s are very high, is it still okay to continue and report the results?

I do my analysis on SPSS and I was doing a ordinal logistic regression to see if the group they belong in (binary, 2 groups ) predict scores on a likert scale 1-7. Whether one of the groups score ...
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How to calculate the odds ratio of continuous variables transformed by restricted cubic splines in a logistic regression model?

I am trying to incorporate several non-linear continuous variables into a logistic model, thus, restricted cubic splines(RCS) is used into the model. However, I don't know how to get the odds ratios ...
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Logistic Regression with Unreasonable Odds Ratio

I am building a logistic regression of TREATED (yes/no) and BLOODLOSS_PERCENT (continuous, skewed right). I have also built a multivariate logistic regression to control for possible confounders, but ...
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Does it make sense to interpret OR when the McFadden pseudo R-squared is 0.15?

I have fitted a logistic regression model (with 6 variables) and obtained a McFadden pseudo R-squared of 0.15. I am now seeking guidance on interpreting odds ratios in light of this value. My ...
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Can different hazard ratios be compared?

Let's say study 1 finds a HR in group X vs control of 1.5. Study 2 finds a HR of 5.4 in group Y vs control. As I understand it, HRs involve the rate of the event happening. Since we do not know the ...
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Contrasts for relative change in proportions #emmeans

I have data indicating quality of life (QOL) as a percentage score from questionnaire data. The data is longitudinal (collected at baseline, 3, 6, 9 and 12 months) and there are other covariates such ...
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Scaling odds ratios and converting them to probability

I'm trying to calculate a scaled odds ratio and convert them into percentages for an analysis I am doing. I have just one independent variable in the model, SAT score. Dependent variable is college ...
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Confusion between hazard ratios and odds ratios

I am getting into survival analysis and am a bit confused about the definition of hazard ratio and odds ratios. This question implies that there is a clear difference between hazard ratios and odds ...
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Discrepancy outputs from epi.2by2 and online calc for Odds Ratio, How to Interpret?

I'm trying to calculate an odds ratio for a table with very few cases. I've tried epitools oddsratio which I see won't work as the uniroot function error occurs due to dividing by 0. The table is as ...
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Researching the effect of bookmakers' odds on predictions

I did an experiment in which I asked 150 people to predict the likelihood of the home team winning eight upcoming NBA playoff matches. Subjects were separated in four different treatments in a 2x2 ...
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If you can report risk ratio reliably, what are some reasons (if any) to report odds ratio instead?

I know that in the case of case-control studies you should report odds ratio, because risk ratio cannot be calculated in this kind of study (I think this is what this question is about When looking at ...
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Odds Ratio - how many times more likely?

Problem: I need to figure out how many times are women more likely to continue attending a class after a certain period of time. Data: Solution: I used odds ratio (see picture). Is it correct to ...
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Case-control study, odds ratio, logistic regression in Stata

I am very excited to be on this forum. I am new to biostatistics and have a question regarding my case-control study, for which I am using STATA for data analysis. All my patients are diabetic. Some ...
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Interpreting marginal trends of logistic model

I've got a logistic model where the annual change for each subject is of interest. Regression, easy. Generate estimated marginal trend for each subject, easy. Now, I have a set of what I presume to be ...
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Incidence risk vs -recalculated incidence risk from incidence rates

I am learning epidemiology and am puzzled with the following issue. Assume we have a prospective cohort study with the following results: 1000 participants alive at baseline (N) 12 years of follow-up ...
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